U.S. Senator Lisa Murkowski will deliver the next Republican weekly national speech on Saturday. It’s the party’s response to the president’s weekly radio address.Murkowski is in the spotlight these days because she’s managing the floor debate for the Keystone XL Pipeline bill. Her office says she plans to focus on the energy potential of the National Petroleum Reserve-Alaska and the coastal plain of the Arctic National Wildlife Refuge.The tradition of the president’s weekly radio address dates back to Franklin Roosevelt. President Obama airs his as a YouTube video.